Karen Bowman gives Nomad's team a mission to infiltrate an Unidad facility in a railway tunnel at Inca Camina, Bolivian. Upon entering the facility, the team find dead Unidad soldiers. Investigating further, they learn that the facility is being used to test drones reverse-engineered from classified Skell-Tech models that the Ghosts use.
Nomad's team eventually encounter Cole D. Walker, a fellow Ghost, who has already infiltrated the facility and informs the team that a Skell-Tech engineer named Daniel Rodriguez Arellano has been selling classified information to Unidad and that Bowman is involved. They are attacked by Unidad reneforcements and are forced to fight their way out of the facility.
Though Walker insists Bowman can't be trusted, Nomad persuades him to return Daniel to a safehouse to investigate Bowman's activities further. Upon dropping Daniel at the safehouse, Nomad and the team decide to tail Daniel. Eavesdropping on his phone calls, the team learn that Daniel is actually is a CIA asset that has been compromised and that Unidad is threatening his family.
Walker soon sets up a meeting at an airfield where he shows Nomad the bodies of his fallen teammates Sergeant Major (SGM) Jeffery K. Griffin and Master Sergeant (MSG) Alejandro J. Sanchez, who were killed by drones Daniel gave to Unidad and that Bowman responsible for their deaths. With a message from Scott saying he's sorry to hear that Walker's teammates are gone. Walker and Nomad go to a meeting between Bowman and Daniel, but find Unidad have captured Bowman and detained Daniel. Nomad interrogates Daniel who reveals that he sold out Bowman to Unidad to protect his family and Walker executes him as revenge.
They regroup and infiltrate M.O.B. Jaguar to rescue Bowman while under Unidad's heavy fire. Escorting her to a safehouse, she claims that Daniel was part of a long-running CIA operation and she was his handler, but never knew the full extent of the mission nor his betrayal. Despite their conflicting views on how to handle the situation, Nomad ultimately persuades Walker to trust their judgement on Bowman, as she has never given him a reason to doubt her.